Piston for internal-combustion engines



W.' H. LIVINGOOD.

PISTON FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED FEB. 12, 1921 1,404, 6 21 P n d Jan. 24, 1922.

Walter. H. Livinyood WITNESS:

ATTORNEY UNITED "STATES PATENT OFFICE.

' WALTER H. LIVINGOOD, OF BERKELEY, CALIFORNIA.

IISTON FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent. Patented J an 24, 1922 Application. filed February 12, 1921. Serial No. 444,465.

tion engines and has more particular reference to the pistons therefor, the primary object being to provide a novel structure of piston by the use of which the wrist pin is effectively prevented from contact with the inner wall of the cylinder whereby scoring and damage thereof is prevented.

Another. object of this invention is to provide means whereby effective lubrication of the wrist pin and piston are attained.

A further object of this invention is the provision of a piston more particularly adapted for internal combustion motors which issimple in construction, comprises but few parts, said parts being of a nature whereby in'the event of renewal or repair they can be readily disassembled and as easily re-assembled after repair or renewal has been effected.

. With the foregoing and other objects in view as will later on be more apparent my invention consists essentially is the novel features of construction, combination and arrangement of parts hereinafter particularly' described and more specifically defined by the appended claims.

In the drawings Figure 1is an elevation of a plston embodying my improvements.

F igure2is a longitudinal central sec, 4

tion of the same.

Figure 3is an end view looking toward the left hand of the preceding figures; and,

Figure 4-is an end view of an inner element or part later, on more particularly referred to.

Referring in detail to the drawings wherein like characters of reference designate the same or corresponding parts in all the views the numeral- 10 indicates the upper half of what I prefer to designate the cap portion of the improved piston and 11 the lower half or skirt portion thereof. Formed integral'with the upper half or cap portion 10 is a rectangular head 12 which provides a means whereby the parts 10 and 11 may be tightly-screwed together by the employment of a wrench or other appropriate tool. The wrist pin is designated by the numeral 13 and it is to be observed that said wrist'pin 1s of a length over all such that it will not pro ect beyond the outer surface or wall of the plston and thereby cannot scrape or contact with the inner wall of the cylinder in which the piston is operating.

In order to provide adequate means'for rop erly lubricating the wrist pin 13 I form ongltudma-lly thereof a groove or channel .14 for-the purpose later on explained. In-

ternally of the cap piece 10, which it will be noted is made hollow I form a screw threaded portion 15 into which is threaded a correspondingly threaded part of the inner extended part 16 of the skirt portion 11, said mner cylindrical part being cut away about its outer peripheral portion to provide an annular 011 collecting chamber 17 and said chamber being supplied with oil due to the splash set up by the crank-not shown-- when the piston is in motion. The oil splashed up by the crank when in motion is thrown on to the inner wall or surface18 of the cylindrical art or member 16 and is con ducted to the 011 chamber 17 through the radial holes or ports 19 and V-shaped angled groove 20 in the crown or top end of said cylindrical part or member 16. The oil thus collecting in the chamber 17 is fed through holes or passages 21 to the wrist pin 13 and the groove 14 as will be clearly understood on an examination ofthe drawings. It is to be here particularly noted that I preferably make the wrist-pin tubular or provided with a bore 22 axially therethrough in order to reduce the weight of metal therein.

Furthermore it is to be observed that the.

an e ective means is furnished forpreventing the rotation or longitudinal displacement of saidwrist' pin 13. This feature of my invention I deem of great importance as it willjbe readily understood that the lower half of the ends of the wrist pin 13 can be easil made to conform approximately to tile peripheral contour of the skirtll and thereby present an unbroken working surface.

, The connecting rod 24 is preferably fitted to the wrist pin 13 by means of a bushing 25, and which constitutes the only movable hearing or other element in my improved rings-not shown.

From the foregoing it will be readily seen reservo1r and that by my invention .1 provide'a simple and effective structure of piston for internal combustion engines, and whilst there has been described the best form thereof at present known to me, it is to be understood the invention is susceptible of various changes in its form, proportions and minor details of construction, and the right is hereby reserved to make such changes as properly fall within the scope of the appended claims.

Having described my invention what I claim as new and desire to procure by Letters Patent is .1. A piston for internal combustion engines comprising .in combination inter-envgageable sections one of which is provided with an annular reduced portion constitutmg a lubricant reservoir, a wrist-pin having notched ends adapted for engagement.

by the inter-engageable sections whereby it is maintained rigid, and means for conducting lubricant to the aforesaid reservoir and feeding same to the wrist-pin.

2. A piston for internal combustion engines comprising in combination inter-connectible sections one of which constitutes a cap portion and the other the support therefor and having a hollow extension adapted to fit within said cap portion, an

annular reduction in the hollow extension constituting a lubricant reservoir, a wristpin having notched ends adapted for engagement by the inter-connectible sections whereby it is maintained rigid, and means' lubricant to the aforesaid eding same to the wrist-pin.-

3. A piston for internal combustion engines comprising in combination inter-connectible sections one of which constitutes a cap portion and the other the support therefor and having a hollow extension for conducting adapted to fit within said cap portion, a tubular wrist-pin having notched ends adapted for locking engagement by the inter-connectible sections, radial passages in the body and angular grooves in the inner end of the hollow extension serving as feed openings into the lubricant reservoir and longitudinal passages connecting said lubricant reservoir with the wrist-pin whereby the lubricant is fed thereto.

4. A piston for internal combustion engines comprising in combination inter-connectible sections one of which constitutes a cap portion and the other the support therefor ]and having a ,hollow extension adapted to fit within said cap portion, a tubular wrist-pin having a longitudinal groove in the outer wall thereof, radial passages in the body and angular grooves in the inner end of the hollow extension serving as feed openings into the lubricant reservoir, and longitudinal passages connecting said lubricant reservoir with the aforesaid longitudinal groove in the wrist-pin whereby the lubricant is fed thereto;

5. A piston for internal combustion engines comprising in combination inter-connectible sections one of which constitutes a cap portion and the other the support therefor and having a hollow extension adapted to fit within the cap portion, a tubular wristpin having a longitudinal groove in the outer wall thereof, radial passages in the body and angular grooves in the inner end of the hollow extension serving as feed openings is WALTER H. LIVINGOOD.

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